BCU 560, BCU 565 · Edition 02.16
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Parameters
11 .1 Scanning the parameters
During operation, the 7-segment display shows the program
step/status.
All the parameters of the BCU can be scanned in numerical
order by repeatedly pressing the Reset/Information button
(for 1 s).
The parameter display is ended 60 seconds after the last time
the button is pressed or by switching off the BCU.
The BCU indicates
when the mains switch has been
switched off. The parameters cannot be scanned when the
BCU is switched off or when a fault message is displayed.
11 .2 Flame control
The BCU is fitted with a flame amplifier which evaluates whether
an adequate flame signal is supplied by the burner using an
ionization electrode or UV sensor.
11 .2 .1 Burner 1 FS1 flame signal switch-off threshold
Parameter 01
The sensitivity at which the burner control unit detects a flame
can be set using parameter 01.
In the case of UV control, this value can be increased, should
the burner to be monitored be influenced by other burners
for example.
During start-up
If the measured flame signal falls below the set value (2 to
20 µA) during the start-up after elapse of the safety time, the
BCU performs a safety shut-down with subsequent fault lock-
out or up to two further start-up attempts. The number of
start-up attempts can be defined using parameter 07, see
page 62 (Burner 1 start-up attempts).
During operation
If the measured flame signal falls below the set value (2 to
20 µA) during operation after elapse of the safety time during
operation (parameter 19), the BCU performs a safety shut-down
with subsequent fault lock-out or a restart. The restart function
